Diameter-variable spiral drill bit

Abstract

The utility model relates to the technical field of building construction drilling equipment, in particular to a variable-diameter auger bit which comprises a target foundation pit, the shape of the target foundation pit is matched with that of a ground cylinder, the upper portion of the ground cylinder is cylindrical, and the lower portion of the ground cylinder is in a circular truncated cone shape. The inner wall of the upper portion of the target foundation pit is matched with the outer wall of the curved surface of the upper portion of the ground cylinder, the inner wall of the lower portion of the target foundation pit is matched with the outer wall of the curved surface of the lower portion of the ground cylinder, and a spiral blade is fixed to the outer wall of the drill bit core column. A plurality of rotating blades which are spirally distributed in the circumferential direction of the drill bit core column are arranged on the outer side of the spiral blade, each rotating blade is in a curved surface shape and is fixed to the outer wall of the drill bit core column through a telescopic arm frame, and each telescopic arm frame is fixedly connected with the spiral blade; the problems that in the construction process of an existing ground cylinder of a fermentation chamber, the compaction degree of backfill soil around the ground cylinder is insufficient, the position precision of the ground cylinder is limited, and the ground cylinder is prone to damage in the backfill process are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling equipment for building construction, in particular to a variable-diameter spiral drill bit. Background Art

[0002] In the construction of the ground tank in the fermentation chamber, the existing technology adopts a step-by-step method to complete the placement and backfilling of the ground tank. First, an existing earth-moving machine is used to excavate a large foundation pit, or manually excavate a single small foundation pit. After excavation, the plain soil in the foundation pit is tamped, and a certain thickness of clay soil and plain soil are laid. Then, the position of the ground tank is determined by measuring and setting out the lines, and then the ground tank is placed. Finally, multi-layer backfilling is carried out around the ground tank.

[0003] However, practice shows that the existing ground tanks in the fermentation chamber have the following deficiencies in the construction process: on the one hand, the placement of the ground tank requires pre-excavating the foundation pit, and then after the ground tank is placed in the appropriate position in the foundation pit, the soil around the ground tank is backfilled. The upper part of the ground tank is cylindrical and the lower part is frustum-shaped. As shown in the appendix Figure 3 Since its special shape and size make it difficult for the backfill soil around it to reach sufficient compaction, which poses a challenge to the construction quality control; on the other hand, the position accuracy of the ground tank is limited; in addition, the ground tank is easily damaged during the backfilling process, especially in the "boundary ditch" area often formed around the ground tank. These problems will shorten the service life of the ground tank and increase the construction difficulty.

[0004] Therefore, it is necessary to invent a variable-diameter spiral drill bit to solve the above problems. Summary of the Utility Model

[0005] The utility model provides a variable-diameter spiral drill bit to solve the problems of insufficient compaction of the backfill soil around the ground tank, limited position accuracy of the ground tank, and easy damage of the ground tank during the backfilling process existing in the construction of the existing ground tank in the fermentation chamber.

[0006] The utility model is realized by adopting the following technical scheme:

[0007] A variable-diameter spiral drill bit, including a target foundation pit, the shape of the target foundation pit matching the outer shape of the ground cylinder. The upper part of the ground cylinder is cylindrical, and the lower part of the ground cylinder is frustum-shaped. The inner wall of the upper part of the target foundation pit matches the curved outer wall of the upper part of the ground cylinder, and the inner wall of the lower part of the target foundation pit matches the curved outer wall of the lower part of the ground cylinder. It also includes a drill bit core column in the shape of a cylinder, with spiral blades fixed on the outer wall of the drill bit core column. There are several rotating blades spirally distributed along the circumference of the drill bit core column outside the spiral blades. Each rotating blade is curved and is fixed to the outer wall of the drill bit core column through a telescopic arm frame, and each telescopic arm frame is fixedly connected to the spiral blade. The bottom end of the drill bit core column is threadedly connected with a drill bit cover, and a cross-shaped rotating scraping blade is installed on the lower surface of the drill bit cover;

[0008] The rotating blades include a first rotating blade and a second rotating blade. The first rotating blade is arranged on the upper part of the outer wall of the drill bit core column, and the second rotating blade is arranged on the lower part of the outer wall of the drill bit core column. The outer surface of the first rotating blade fits with the inner wall of the upper part of the target foundation pit, and the outer surface of the second rotating blade fits with the inner wall of the lower part of the target foundation pit.

[0009] Furthermore, the telescopic arm frame includes an outer arm tube and an inner arm tube. The tail end of the outer arm tube is fixed to the outer wall of the drill bit core column, the head end of the outer arm tube is inserted and sleeved with the tail end of the inner arm tube, the head end of the inner arm tube is fixed to the inner surface of the corresponding first rotating blade or second rotating blade, an installation hole is opened on the side surface of the outer arm tube, and a high-strength bolt is threadedly connected in the installation hole. The tail end of the high-strength bolt abuts against the outer wall of the corresponding inner arm tube.

[0010] Furthermore, several soil collection ports are opened on the outer wall of the drill bit core column.

[0011] Furthermore, the rotating scraping blade is arranged at an angle with the lower surface of the drill bit cover, and the angle range of the angle is 10 degrees to 30 degrees.

[0012] Furthermore, an installation groove is opened in the middle of the inner wall of the drill bit core column, and a vibration motor is installed in the installation groove.

[0013] Furthermore, scale lines are engraved on the outer wall of the inner arm tube.

[0014] The structure design of the utility model is reasonable and reliable, and the operation is simple. By precisely controlling the shape and size of the target foundation pit, the hole can be successfully formed at one time, avoiding subsequent soil backfilling and problems such as insufficient compaction of backfill soil and easy damage of the ground cylinder during the soil backfilling process, ensuring the verticality and accuracy of the target foundation pit, and thus improving the overall construction quality; moreover, it reduces the uncertainty of manual labor and lowers the labor cost; at the same time, the variable diameter design greatly improves the drilling speed, reduces the time of repetitive operations, and improves the construction efficiency and flexibility; further, it can be used for various circular pits with diverse specifications and different diameters, such as pits, pile foundations, and tree pits, having the advantage of strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the utility model.

[0016] Figure 2 is a schematic diagram of the rotary scraping blade in the utility model.

[0017] Figure 3 is a cross-sectional view of the ground cylinder of the existing fermentation chamber.

[0018] In the figure: 1, ground cylinder; 2, drill bit core column; 3, spiral edge; 4, drill bit cover; 5, rotary scraping blade; 6, first rotary blade; 7, second rotary blade; 8, outer boom tube; 9, inner boom tube; 10, high-strength bolt; 11, soil collection port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] A variable-diameter spiral drill bit includes a target foundation pit, the shape of the target foundation pit matching the outer shape of the ground cylinder 1. The upper part of the ground cylinder 1 is cylindrical, and the lower part of the ground cylinder 1 is frustum-shaped. The inner wall of the upper part of the target foundation pit matches the curved outer wall of the upper part of the ground cylinder 1, and the inner wall of the lower part of the target foundation pit matches the curved outer wall of the lower part of the ground cylinder 1. As shown in the attached Figure 1 ~attached Figure 3 figures, it further includes a drill bit core column 2 in the shape of a cylinder. A spiral edge 3 is fixed on the outer wall of the drill bit core column 2. A number of rotary blades are arranged on the outside of the spiral edge 3 and are spirally distributed along the circumferential direction of the drill bit core column 2. Each rotary blade is curved and is fixed to the outer wall of the drill bit core column 2 through a telescopic boom, and each telescopic boom is fixedly connected to the spiral edge 3. The bottom end of the drill bit core column 2 is threadedly connected with a drill bit cover 4, and a rotary scraping blade 5 distributed in a cross shape is installed on the lower surface of the drill bit cover 4;

[0020] The rotary blade includes a first rotary blade 6 and a second rotary blade 7. The first rotary blade 6 is arranged on the upper part of the outer wall of the drill core column 2, and the second rotary blade 7 is arranged on the lower part of the outer wall of the drill core column 2. The outer surface of the first rotary blade 6 is attached to the upper inner wall of the target foundation pit, and the outer surface of the second rotary blade 7 is attached to the lower inner wall of the target foundation pit.

[0021] As shown in the attached Figure 1 ~attached Figure 3 figure, a plurality of soil collection ports 11 are provided on the outer wall of the drill core column 2.

[0022] In the present utility model, the drill core column 2 serves as the core load-bearing component, supporting the entire drill structure, ensuring the stability and strength during the process of drilling the target foundation pit, providing a stable drilling axis, ensuring the perpendicularity and accuracy of the target foundation pit; the spiral blade 3 and the rotary blade are jointly responsible for cutting the soil body and pushing it to the soil collection port 11 for soil collection; the first rotary blade 6 and the second rotary blade 7 respectively correspond to different parts of the target foundation pit, precisely drilling the soil body, realizing a smooth transition from the upper inner wall of the target foundation pit to the lower inner wall of the target foundation pit, ensuring that the ground cylinder 1 can be accurately positioned and control the shape and size of the target foundation pit, and avoiding the subsequent soil backfilling caused by the mismatch between the shape of the target foundation pit and the ground cylinder 1, thereby causing problems such as insufficient compaction degree of the backfill soil and easy damage of the ground cylinder 1 during the soil backfilling process, while reducing the uncertainty of manual work and lowering the labor cost; the drill bit cover 4 is used to seal the bottom of the drill core column 2, and cooperating with the rotary scraping blade 5 helps to cut and scrape the soil material at the bottom of the target foundation pit, ensuring the flatness of the bottom of the target foundation pit, improving the fitting degree between the ground cylinder 1 and the target foundation pit, and at the same time facilitating the disassembly of the drill bit cover 4 after the rotary drilling of the present drill bit is completed, so as to pour out the soil material in the drill core column 2 outside the target foundation pit.

[0023] As shown in the attached Figure 1 ~attached Figure 3 figure, the telescopic boom includes a boom outer tube 8 and a boom inner tube 9. The tail end of the boom outer tube 8 is fixed to the outer wall of the drill core column 2, the head end of the boom outer tube 8 is inserted and sleeved with the tail end of the boom inner tube 9, the head end of the boom inner tube 9 is fixed to the inner surface of the corresponding first rotary blade 6 or second rotary blade 7, an installation hole is provided on the side of the boom outer tube 8, and a high-strength bolt 10 is threadedly connected in the installation hole, and the tail end of the high-strength bolt 10 abuts against the outer wall of the corresponding boom inner tube 9.

[0024] The structural design of the telescopic boom composed of the outer boom tube 8, the inner boom tube 9, the mounting holes, and the high-strength bolts 10 can adjust the extension length of the rotary blade, thereby enabling the operation of drilling target foundation pits of different diameters, greatly improving the construction efficiency and flexibility, reducing the time of repetitive operations, and facilitating the disassembly and replacement of the inner boom tube 9 and the rotary blade.

[0025] As shown in the attached Figure 1 ~attached Figure 3 figure, the rotary scraping blade 5 is arranged at an angle with the lower surface of the drill bit cover 4, and the angle range of the angle is 10 degrees to 30 degrees.

[0026] The structural design of the rotary scraping blade 5 arranged at an angle with the lower surface of the drill bit cover 4 increases the scraping ability of the rotary scraping blade 5 on the soil at the bottom of the target foundation pit, further improving the flatness of the bottom of the target foundation pit.

[0027] As shown in the attached Figure 1 ~attached Figure 3 figure, a mounting groove is provided in the middle of the inner wall of the drill bit core column 2, and a vibration motor is installed in the mounting groove.

[0028] The structural design of the vibration motor improves the efficiency of drilling the target foundation pit through vibration, not only accelerating the process of drilling the target foundation pit, but also reducing the risk of jamming of this drill bit during operation. At the same time, it is convenient to vibrate and pour out the soil material in the drill bit core column 2 outside the target foundation pit after the rotary drilling of this drill bit is completed.

[0029] As shown in the attached Figure 1 ~attached Figure 3 figure, scale lines are engraved on the outer wall of the inner boom tube 9.

[0030] The structural design of the scale lines facilitates the staff to observe and control the telescopic length of the inner boom tube 9, making the operation more intuitive and simple, and improving the accuracy of drilling the target foundation pit.

[0031] During use, first loosen the high-strength bolt 10, slide the inner pipe 9 of the adjustable boom to adjust the extension lengths of the first rotary blade 6 and the second rotary blade 7 relative to the outer pipe 8 of the boom. By observing the scale lines on the outer wall of the inner pipe 9 of the boom, ensure that the extension length of each rotary blade reaches the designed value required for the target foundation pit. Then tighten the high-strength bolt 10 to install this drill bit on the drill rig. After positioning and determining the position of the hydraulic cylinder 1 by setting out, align the drill bit core column 2 of this drill bit vertically downward and the drill bit cover 4 with the marked point. Start the drill rig and the vibration motor. The drill bit core column 2 rotates and advances downward. The telescopic boom drives the spiral blade 3 and the rotary blades to rotate and cut the soil. Part of the soil is cut by the rotary blades and pushed out of the target foundation pit, and the other part is cut by the spiral blade 3 and pushed into the soil collection port 11 for soil collection. During this process, the vibration motor generates vibration to accelerate the fragmentation and collection of the soil, improving the working efficiency. When this drill bit reaches the predetermined depth, the rotary scraping blade 5 cuts and levels the soil at the bottom of the target foundation pit to ensure the flatness of the bottom of the target foundation pit. Then lift this drill bit, and use the drill bit core column 2 and the spiral blade 3 to carry the excess soil out of the target foundation pit. Next, turn off the drill rig and the vibration motor. After unscrewing and removing the drill bit cover 4, start the vibration motor to pour out the soil in the drill bit core column 2 by vibration, thus completing the use of this drill bit. Subsequently, perform the base treatment in the target foundation pit and the placement work of the hydraulic cylinder 1; it overcomes the problems existing in the construction of the hydraulic cylinder 1 in the existing fermentation chamber, such as insufficient compaction degree of the backfill soil around the hydraulic cylinder 1, limited position accuracy of the hydraulic cylinder 1, and the hydraulic cylinder 1 being easily damaged during the backfill process.

[0032] In the description of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A variable diameter spiral drill bit, comprising a target foundation pit, the shape of the target foundation pit matches the shape of a ground cylinder (1), the upper part of the ground cylinder (1) is cylindrical, the lower part of the ground cylinder (1) is truncated, the upper inner wall of the target foundation pit matches the upper curved outer wall of the ground cylinder (1), and the lower inner wall of the target foundation pit matches the lower curved outer wall of the ground cylinder (1), characterized in that: It also comprises a cylindrical drill core column (2), a spiral blade (3) being fixed on the outer wall of the drill core column (2), a plurality of rotating blades being arranged on the outer side of the spiral blade (3) and distributed in a spiral direction along the circumference of the drill core column (2), each rotating blade being in a curved surface shape and being fixed to the outer wall of the drill core column (2) via a retractable arm, and each retractable arm being fixedly connected to the spiral blade (3), a drill cover (4) being threadedly connected to the bottom end of the drill core column (2), and rotating scrapers (5) distributed in a cross shape being installed on the lower surface of the drill cover (4); The rotary blade comprises a first rotary blade (6) and a second rotary blade (7); the first rotary blade (6) is arranged on the upper part of the outer wall of the drill core column (2); the second rotary blade (7) is arranged on the lower part of the outer wall of the drill core column (2); the outer surface of the first rotary blade (6) fits with the upper inner wall of the target foundation pit, and the outer surface of the second rotary blade (7) fits with the lower inner wall of the target foundation pit.

2. The variable diameter spiral drill bit according to claim 1, characterized in that: The telescopic boom comprises an outer boom tube (8) and an inner boom tube (9); the rear end of the outer boom tube (8) is fixed to the outer wall of the drill core column (2); the head end of the outer boom tube (8) is connected to the rear end sleeve of the inner boom tube (9); the head end of the inner boom tube (9) is fixed to the inner surface of the first rotating blade (6) or the second rotating blade (7) corresponding thereto; a mounting hole is provided on the side of the outer boom tube (8); a high-strength bolt (10) is threadedly connected to the mounting hole; and the tail end of the high-strength bolt (10) contacts the outer wall of the corresponding inner boom tube (9).

3. The variable diameter spiral drill bit according to claim 1, characterized in that: The outer wall of the drill core column (2) is provided with a plurality of soil material collecting openings (11).

4. The variable diameter spiral drill bit according to claim 1, characterized in that: The rotating scraper (5) and the lower surface of the drill head cover (4) are arranged at an angle, and the angle range of the angle is 10 degrees to 30 degrees.

5. The variable diameter spiral drill bit according to claim 1, characterized in that: A mounting groove is provided in the middle of the inner wall of the drill core column (2), and a vibration motor is installed in the mounting groove.

6. The variable diameter spiral drill bit according to claim 2, characterized in that: The outer wall of the arm inner tube (9) is engraved with scale lines.

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